I am not able to use mic with my computer when I tried the settings for mic . It is not allowing me to make any kind of changes in it ... I think I need the drivers for it please help me for the same asap

Visit the manufacturer website to download the drivers.
If you are facing problem in downloading drivers then I would suggest to use driver scanning tool that will search for drivers online and will show a list of missing and outdated drivers.
You can get driver scanner 2013 here: DriverScanner2013.net